KR102401732B1 - Mono-fluid type admixture composition for concrete comprising cellulose thickener - Google Patents

Abstract

The present invention relates to a one-component type admixture composition for concrete including a cellulose-based thickener, more specifically, to use an emulsifier to make a concrete admixture and a thickener to be a one-component and use a one-component type admixture composition for concrete to simply assign thickening performance.

Description

Admixture composition for one-component concrete containing a cellulose thickener {MONO-FLUID TYPE ADMIXTURE COMPOSITION FOR CONCRETE COMPRISING CELLULOSE THICKENER}

The present invention relates to a one-component admixture composition for concrete comprising a cellulose-based thickener, and more specifically, it is possible to form a one-component admixture for concrete and a thickener using an emulsifier, and by using the one-component admixture composition for concrete It is characterized in that it can easily give thickening performance.

Concrete as a main material for building structures not only exhibits superior performance compared to other materials in terms of constructability, strength, durability and maintenance, but also has economic advantages, so it is one of the most used materials in construction work.

However, concrete has the potential to deteriorate due to various environmental, material, and construction factors, and when cracks occur in concrete, the performance such as strength and durability of the building structure is reduced, and the aesthetics of the building structure are damaged and It is recognized as a big problem because it can cause psychological anxiety factors of users, and further decrease the lifespan and usability of the building structure, which can lead to enormous economic loss.

Cracks that occur in concrete are caused by several factors, and the most frequent case is drying shrinkage. Drying shrinkage is caused by a decrease in volume due to drying inside the concrete due to the external movement of moisture inside the concrete. Dry shrinkage is found in most concrete, and when the concrete member is constrained, internal stress is generated due to the volume reduction of the concrete, which causes cracks in the concrete. This is recognized as the biggest cause of cracks and defects in concrete.

Admixtures are sometimes added to the composition for forming concrete in order to prevent cracks in concrete and improve physical properties. Concrete admixtures are additives added to improve the performance of concrete compositions such as cement dough, mortar, and concrete, and are mainly used for construction of structures in civil engineering fields.

On the other hand, due to the recent shortage of aggregates, aggregates with poor quality are being applied to concrete production. As a result, the quality of concrete deteriorates, which adversely affects concrete workability and compressive strength. Specifically, there is a problem in that the slump formation is poor due to the roughening and cracking of concrete or the separation of materials. It can be solved by increasing the amount of cement, but it is not easily implemented because it causes a cost increase.

Another method is to improve concrete workability by adding a thickener to the concrete. A thickener is an effective method of improving workability, but since it is difficult to form a one-component mixture with an admixture for general concrete, there is a difficulty in that the admixture must be added first and then the thickener must be added as a separate input method later.

In this regard, Korean Patent Registration No. 10-2165057 discloses a concrete composition containing a thickener and a method for manufacturing the same.

The present invention has been devised to solve the problems of the prior art, and by using an emulsifier, it is possible to form an admixture for concrete and a thickener into a one-component type, and to provide a one-component admixture composition for concrete having excellent phase stability.

In addition, the present invention is to provide a one-component admixture composition for concrete that can easily impart thickening performance and improve workability by injecting a one-component admixture composition for concrete during concrete production and a concrete composition comprising the same have.

As a technical means for achieving the above-described technical problem, one aspect of the present invention is,

admixture; thickener; and an emulsifier; and an admixture composition for one-component concrete comprising.

The admixture may include at least one selected from the group consisting of an air entraining agent, a water reducing agent, an accelerator, a retarder, a quick setting agent, a waterproofing agent, a foaming agent, a foaming agent, an antifoaming agent, a rust preventive agent, and a strength enhancer.

The thickener may be a cellulosic thickener.

The cellulose-based thickener is methyl cellulose (Methyl Cellulose, MC), ethyl cellulose (Ethyl Cellulose, EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (Hydroxypropyl Cellulose, HPC), hydroxyethyl methyl cellulose (Hydroxyethyl Methyl Cellulose, HEMC), Hydroxypropyl Methyl Cellulose (HPMC), Hydroxypropyl Ethyl Cellulose (HPEC), Hydro Bentonite Methyl Cellulose (HBMC), Hydro Ethyl Cellulose (Hydro Ether Ethyl Cellulose, HEEC) and carboxymethyl cellulose (Carboxymethyl Cellulose, CMC) may include at least one selected from the group consisting of.

The emulsifier is an aliphatic ester, sodium lauryl sulfate, an alkyl benzene sulfonate, an alkyl phosphate salt, a dialkyl sulfosuccinate, It may include at least one selected from the group consisting of polyoxyethylene alkyl ether, polyethylene glycol oleyl ether, and alkyl amine ester.

The content of the admixture may be 5 to 40 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The content of the thickener may be 0.1 to 3 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The content of the emulsifier may be 0.05 to 0.5 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The admixture composition for one-component concrete may further include water.

Another aspect of the present invention provides a concrete composition comprising the one-component concrete admixture composition.

The one-component admixture composition for concrete of the present invention can form a one-component admixture and thickener for concrete by using an emulsifier, and has excellent phase stability.

In addition, by adding the one-component admixture composition for concrete of the present invention during concrete production, thickening performance can be provided simply, and workability can be improved.

1 is an image immediately and 3 months after the preparation of the admixture composition for concrete prepared according to Comparative Example 1-1.
2 is an image immediately and 3 months after the preparation of the admixture composition for concrete prepared according to Comparative Example 1-2.
3 is an image immediately and 3 months after the preparation of the one-component concrete admixture composition prepared according to Example 1.
4 is a slump test result of concrete prepared with a concrete composition prepared according to Comparative Example 2-2.
5 is a slump test result of concrete prepared with the concrete composition prepared according to Example 2.
6 is a slump test result of concrete prepared with the concrete composition prepared according to Comparative Example 2-1.

Hereinafter, the present invention will be described in more detail. However, the present invention may be embodied in various different forms, and the present invention is not limited by the embodiments described herein, and the present invention is only defined by the claims to be described later.

In addition, the terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the entire specification of the present invention, 'including' a certain component means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, the admixture composition for one-component concrete of the present invention will be described.

The present invention is an admixture; thickener; and an emulsifier; provides an admixture composition for one-component concrete comprising.

Admixtures are concrete constituents other than portland cement, mixing water, and aggregate, and are additives used to impart specific properties to concrete.

The admixture may include at least one selected from the group consisting of an air entraining agent, a water reducing agent, an accelerator, a retarder, a quick setting agent, a waterproofing agent, a foaming agent, a foaming agent, an antifoaming agent, a rust preventive agent, and a strength enhancer.

Air-entraining agent generates spherical microbubbles (10 ~ 200 ㎛) inside the concrete, and is used to improve the workability of concrete by the ball bearing action of the air bubbles and to improve the resistance to freezing and thawing. It is an admixture

A water-reducing agent is added to improve the workability of concrete, and is an admixture added not to add additional water because adding water may harm the properties of hardened concrete. The water reducing agent can secure workability by increasing the mobility of cement particles.

Accelerators are admixtures usually used when faster strength development than concrete is required.

Retardant is an admixture used to delay the setting time of cement. When it is necessary to prevent the concrete from setting quickly due to hot weather, or when special finishing work such as concrete work requiring a long transport distance or exposing aggregate is required. agent can be used.

Accelerating agents are admixtures used to accelerate the setting of concrete.

A water proof agent is an admixture that increases waterproofness by mixing with concrete.

A foaming agent is an admixture that introduces stable air bubbles by a physical method for the purpose of reducing the unit volumetric weight of concrete or imparting thermal insulation properties.

A foaming agent is an admixture used to reduce the weight of a member or increase heat insulation by generating gas through a chemical reaction to generate fine bubbles.

An antifoaming agent is added for the purpose of preventing the formation of air bubbles and removing the generated air bubbles.

The rust inhibitor serves to protect the metal in concrete, for example, the reinforcing bar from corrosion, and acts as a corrosion inhibitor to prevent the corrosion of the reinforcing bar or steel even when a relatively small amount is used without affecting the concrete.

The thickener may be a cellulosic thickener.

The cellulose-based thickener is methyl cellulose (Methyl Cellulose, MC), ethyl cellulose (Ethyl Cellulose, EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (Hydroxypropyl Cellulose, HPC), hydroxyethyl methyl cellulose (Hydroxyethyl Methyl Cellulose, HEMC), Hydroxypropyl Methyl Cellulose (HPMC), Hydroxypropyl Ethyl Cellulose (HPEC), Hydro Bentonite Methyl Cellulose (HBMC), Hydro Ethyl Cellulose (Hydro Ether Ethyl Cellulose, HEEC) and carboxymethyl cellulose (Carboxymethyl Cellulose, CMC) may include one or more selected from the group consisting of, preferably hydroxyethyl cellulose.

The emulsifier is an aliphatic ester, sodium lauryl sulfate, an alkyl benzene sulfonate, an alkyl phosphate salt, a dialkyl sulfosuccinate, It may include at least one selected from the group consisting of polyoxyethylene alkyl ether, polyethylene glycol oleyl ether, and alkyl amine ester, preferably polyoxy Ethylene alkyl ether and polyethylene glycol oleyl ether may be used in combination. Specifically, polyoxyethylene octadecyl ether may be used as the polyoxyethylene alkyl ether.

The emulsifier allows the admixture and the thickener to be one-component, and the use of the emulsifier has excellent phase stability when mixed with the admixture for concrete and the thickener.

The content of the admixture may be 5 to 40 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The content of the thickener may be 0.1 to 3 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The content of the emulsifier may be 0.05 to 0.5 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The admixture composition for one-component concrete may further include water.

The content of the water may be 56.5 to 94.85 parts by weight based on 100 parts by weight of the total amount of the admixture composition for one-component concrete.

The present invention also provides a concrete composition comprising the admixture composition for concrete.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.

<Example>

Example 1: Preparation of admixture composition for one-component concrete (use of emulsifier O)

An admixture, a cellulose-based thickener (high viscosity), an emulsifier, and water were sequentially stirred in a weight ratio of 14:1:0.1:84.9, and further stirred for 1 hour to prepare an admixture composition for one-component concrete.

At this time, PCE type admixture as the admixture, HECELLOSE as the thickener (viscosity 3500~5000 mPa·s at 25℃ at 1% dilution), and Emulsifier A and 12 with a Hydrophile-Lipophile Balance (HLB) value of 3~5 as the emulsifier Emulsifier B of ~14 was used in combination. Specifically, the emulsifier A was polyethylene glycol oleyl ether, and the emulsifier B was polyethylene glycol octadecyl ether in a 2:8 ratio.

Comparative Example 1: Preparation of admixture composition for concrete (use of emulsifier X)

Comparative Example 1-1

An admixture, a cellulose-based thickener (high viscosity), and water were sequentially added with stirring in a weight ratio of 14:1:85, and further stirred for 1 hour to prepare an admixture composition for concrete.

In this case, PCE type admixture was used as the admixture, and HECELLOSE (viscosity 3500 to 5000 mPa·s at 25° C. at 1% dilution) was used as the thickener.

Comparative Example 1-2

An admixture, a cellulose-based thickener (low viscosity), and water were sequentially stirred at a weight ratio of 14:1:85, and further stirred for 1 hour to prepare an admixture composition for concrete.

At this time, a PCE type admixture was used as the admixture, and HECELLOSE (viscosity 1000-1500 mPa·s at 25°C at 1% dilution) was used as the thickener.

Example 2: Preparation of concrete composition

A concrete composition was prepared with the composition shown in Table 1 below using the admixture composition for one-component concrete prepared according to Example 1.

Comparative Example 2: Preparation of a concrete composition

Comparative Example 2-1

A concrete composition was prepared with the composition shown in Table 1 below using the admixture composition for concrete prepared according to Comparative Example 1-1.

Comparative Example 2-2

A concrete composition was prepared with the composition shown in Table 1 below using the admixture composition for concrete prepared according to Comparative Example 1-2.

division W/B
(%) S/a
(%) Unit Weight(kg/m ³ ) AD
(B x %) W C S/P F/A S
(Natural History) S
(Busunsa) G Example 2 49.5 49.0 168 221 68 52 - 880 920
1.0 Comparative Example 2-1 1.0 Comparative Example 2-2 1.0

In Table 1 above,

W/B: water/binder (cement + slag powder + fly ash)

S/a: fine sand/diameter 25mm coarse aggregate

W: mixing water

C: Cement (Ssangyong)

S/P: Slag Powder (Sampyo)

F/A: Fly Ash (Taean Thermal Power Company)

S: fine sand (F/M: 2.86, #200 pass 2.73%)

G: 25mm diameter coarse aggregate

AD: Based on the total weight of the binder, the added amount of the admixture composition for concrete.

<Experimental example>

Experimental Example 1: One-component type experiment

According to Example 1, Comparative Example 1-1, and Comparative Example 1-2, an admixture composition for concrete was prepared and photographed immediately after preparation, and images were compared by photographing 3 months later.

1 is an image immediately and 3 months after the preparation of the admixture composition for concrete prepared according to Comparative Example 1-1, and FIG. 2 is an image immediately and 3 months after the preparation of the admixture composition for concrete prepared according to Comparative Example 1-2. and FIG. 3 is an image immediately and 3 months after the preparation of the one-component concrete admixture composition prepared according to Example 1.

1 to 3, in the case of Comparative Example 1-1, in which a concrete admixture composition containing a high-viscosity cellulose-based thickener was prepared without an emulsifier, a slight phase separation phenomenon appeared immediately after production, and a complete phase separation phenomenon was observed after 3 months. could see what had happened. In the case of Comparative Example 1-2, in which an admixture composition for concrete containing a low-viscosity cellulose-based thickener was prepared without an emulsifier, it was confirmed that a slight phase separation occurred after 3 months. On the other hand, in Example 1 using the emulsifier, phase separation did not occur immediately after manufacture as well as after 3 months, and it was confirmed that the admixture for concrete and the thickener were one-component.

That is, in the case of a thickener with a high thickening power, it is difficult to mix due to the occurrence of phase separation or sediment, and a thickener with a low thickening power can be mixed with an admixture, but phase separation may occur over time. However, by using an emulsifier, the admixture for concrete and the thickener can be formed into a one-component type, and when the admixture for concrete and the thickener are mixed, the phase stability is excellent.

Experimental Example 2: Concrete Performance Test

Concrete (standard: 25-24-150) was prepared using the concrete composition prepared according to Example 2, Comparative Example 2-1, and Comparative Example 2-2, and fluidity, air content, temperature, and coagulation of the prepared concrete Time and compressive strength were evaluated in the following manner.

(liquidity assessment)

The fluidity of concrete was evaluated by performing a slump test of concrete in accordance with KS F 2402 regulations. The results are shown in Table 2 and FIGS. 4 to 6 below.

(Air content evaluation)

The air content of concrete was evaluated by measuring the air content of concrete according to the air content test method by the air chamber pressure method specified in KS F 2421. The results are shown in Table 2 below.

(temperature evaluation)

The temperature of the concrete was measured using an alcohol thermometer. The results are shown in Table 2 below.

(Evaluation of setting time)

The setting time of concrete was evaluated by measuring the setting time according to the concrete setting time test method using a penetration resistance needle in KS F 2436 regulations. The results are shown in Table 2 below.

(Compressive strength evaluation)

The compressive strength test of concrete was performed in accordance with KS F 2405 after a predetermined curing was completed, and was measured using a 2,000KN (224 ton) UTM tester. The results are shown in Table 2 below.

Slump (mm) Air (%) Con'c temperature
(℃) Setting time (min) Compressive strength (MPa) Early 60 minutes Early 60 minutes sequel closing 3 days 7 days 28 days Comparative Example 2-1 165 130 5.2 4.7 18.9 +30 +37 13.76 21.37 27.43 Comparative Example 2-2 170 155 4.9 4.3 18.7 +30 +35 16.95 24.13 30.88 Example 2 170 155 5.4 5.0 18.3 +30 +32 14.96 23.89 30.21

Referring to Table 2, in the case of Example 2 using an emulsifier and Comparative Example 2-2 containing a thickener with a low thickening power, the difference in slump loss was 15 mm at the initial stage and after 1 hour, and the slump decrease was low, but the thickener with high thickening power In the case of Comparative Example 2-1 including Therefore, when concrete is formed using the concrete composition prepared according to Example 2, the fluidity maintenance performance of concrete can be stably increased and workability can be improved. In addition, it was confirmed that the concrete prepared by using the concrete composition prepared according to Example 2 did not decrease in compressive strength over time.

Also, air content is an evaluation item for whether this experiment was tested under appropriate conditions. The standard is 4.5±1.5, and it shall be tested within this standard. Temperature is also a matter for evaluation conditions, and setting time is an evaluation item for whether new materials affect basic properties of concrete when new materials are used. It was confirmed that the concrete formed using the concrete composition prepared according to Example 2 fell within the specifications. Therefore, it was confirmed that the new material, the emulsifier, did not adversely affect the properties of concrete by suitable experimental methods.

4 to 6 , in the case of the concrete formed using the concrete composition prepared according to Example 2 and Comparative Example 2-1, it was confirmed that a slump that was not rough and did not crack was formed. On the other hand, in the case of the concrete formed using the concrete composition prepared according to Comparative Example 2-2, it was confirmed that a rough and cracked slump was formed.

That is, it is possible to prevent the formation of a rough and cracked slump by using an emulsifier to form a concrete admixture and a thickener into a one-component type.

Above, the present invention has been described in detail with preferred embodiments with reference to the drawings, but the scope of the technical idea of the present invention is not limited to these drawings and examples. Accordingly, various modifications or equivalent ranges of embodiments may exist within the scope of the technical spirit of the present invention. Therefore, the scope of the technical idea according to the present invention should be interpreted by the claims, and the technical idea within the equivalent or equivalent scope should be interpreted as belonging to the scope of the present invention.

Claims (10)

admixture; thickener; As an admixture composition for one-component concrete comprising; and an emulsifier,
The emulsifier is an aliphatic ester, an alkyl benzene sulfonate, an alkyl phosphate salt, a dialkyl sulfosuccinate, a polyoxyethylene alkyl ether. , polyethylene glycol oleyl ether (polyethylene glycol oleyl ether) and alkyl amine ester (alkyl amine ester), characterized in that it comprises at least one selected from the group consisting of a one-component concrete admixture composition. According to claim 1,
The admixture comprises at least one selected from the group consisting of air entraining agents, water reducing agents, accelerators, retarders, quick-setting agents, waterproofing agents, foaming agents, foaming agents, defoamers, rust preventives, and strength enhancers. Admixture composition for one-component concrete . According to claim 1,
The thickener is a one-component concrete admixture composition, characterized in that it is a cellulose-based thickener. 4. The method of claim 3,
The cellulose-based thickener is methyl cellulose (Methyl Cellulose, MC), ethyl cellulose (Ethyl Cellulose, EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (Hydroxypropyl Cellulose, HPC), hydroxyethyl methyl cellulose (Hydroxyethyl Methyl Cellulose, HEMC), Hydroxypropyl Methyl Cellulose (HPMC), Hydroxypropyl Ethyl Cellulose (HPEC), Hydro Bentonite Methyl Cellulose (HBMC), Hydro Ethyl One-component concrete admixture composition comprising at least one selected from the group consisting of cellulose (Hydro Ether Ethyl Cellulose, HEEC) and carboxymethyl cellulose (CMC). delete According to claim 1,
The admixture composition for one-component concrete, characterized in that the content of the admixture is 5 to 40 parts by weight based on 100 parts by weight of the total admixture composition for one-component concrete. According to claim 1,
An admixture composition for one-component concrete, characterized in that the content of the thickener is 0.1 to 3 parts by weight based on 100 parts by weight of the total admixture composition for one-component concrete. According to claim 1,
The admixture composition for one-component concrete, characterized in that the content of the emulsifier is 0.05 to 0.5 parts by weight based on 100 parts by weight of the total admixture composition for one-component concrete. The method of claim 1,
The one-component admixture composition for concrete further comprises water. A concrete composition comprising the admixture composition for one-component concrete according to claim 1 .

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